Create RULES.md

Copying dice-rolling rules from manual

RULES.md

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+# Basic Terminology
+These dice are called character dice, because they reflect things about your character that can help you succeed. 
+A d20 is known as a fortune die, and it transcends these benchmarks.
+
+# Critical Successes
+When you roll a 20 on the fortune die and your action succeeds, it is considered a critical success.
+When you roll a critical success, you can choose to either increase your impact by 2 or gain 1 inspiration point.
+
+# Critical Fumble
+A Critical Fumble means something has gone seriously wrong with your action/counter and within the scene.
+When you roll a 1 on a d20 die result it is considered a critical fumble. 
+When this happens, you choose one other die in your pool that didn’t roll a 1 and scratch (remove) it. 
+Calculate your action total and impact with your remaining die results. 
+You may roll a critical fumble and still succeed in your action. 
+You also critically fumble if your action is successfully countered and you roll a 1-3 on the d20 (in other words if you fail to generate any impact at all).
+Whenever you roll a critical fumble, you gain 1 inspiration point. 
+
+# Success or Failure
+To figure out whether your action succeeds, compare your action total to the opposing counter total. 
+If the counter total is higher, you fail; otherwise, your action succeeds. 
+**An unsuccessful action cannot inflict stress.**
+
+# Impact
+Once you calculate your action total, determine your action’s Impact – the effect your action has on the scene. 
+Look at the dice you rolled in your pool. Each die that rolls a 4 or higher generates one point of impact. 
+This includes the dice you added for your action total, as well as the fortune die. 
+Character dice that roll 10 or higher generate two impact.
+
+## Minimum Impact: 
+Your character is highly capable. 
+Even if their action is countered, they are still able to accomplish something positive with their action. 
+So long as you roll a 4 or higher on your fortune die you still generate a minimum impact of 1. 
+You may spend this on any result except causing stress.  
+
+# Advantage and Disadvantage
+Sometimes the rules grant you Advantage on a particular roll. 
+When that happens, you roll one additional fortune die as part of your pool. 
+You still choose two die results for your action total, only one of which may be a d20. 
+If multiple situations affect a roll and each one grants advantage, you still only add one additional d20 to your pool.
+
+There are also times when the rules impose Disadvantage on a roll. 
+When you roll with disadvantage, you roll one additional fortune die as part of your pool, but the highest-rolling d20 in your pool is scratched. 
+If multiple situations affect a roll and each one grants disadvantage, you still only add one additional d20 to your pool.
+
+If circumstances cause a roll to have both advantage and disadvantage, you are considered to have neither of them, and you do not add an additional d20 to your pool. 
+This is true even if multiple circumstances impose disadvantage and only one grants advantage or vice versa. 
+In such a situation, you have neither advantage nor disadvantage.
+
+# Scratching a Die
+In some situations (such as when you have taken too much stress), the rules require you to scratch a die. 
+This is done after you roll your dice pool. 
+Once all the dice are rolled, a scratched die is removed from your roll entirely, and cannot be used for your action total or your impact—it’s as if it was never part of your pool at all.
+
+# The Limits of Fortune
+Your action total can never include more than one d20 fortune die.
+
+# Stress
+- Reduce your highest die if you are Overwhelmed OR Staggered. 
+- Scratch your highest die if you are Overwhelmed AND Staggered.
+
+# Impact Total
+Count how many dice rolled 4+ for your Impact 
+Minimum 1 Impact if your fortune die rolled 4+, even if your action was countered.